Signoe op one-half to william phillips thompson



(No Model.)

' J. S. LEWIS.

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UNITED STATES PATENT OFEIGE.

JOSEPH SLATER LEWIS, OE BIRKENHEAD, COUNTY OF CHESTER, AS- SIGNOR OE ONE-HALE TO \VILLIAM PHILLIPS THOMPSON, OE LIVER- POOL, ENGLAND.

TERMINAL INSULATOR.

SPECIFICATION forming part of Letters Patent No. 298,594, dated May 13, 1884.

' Application filed August 10, 1883. (No model.)

To aZZ whom, it may concern:

Be it known that I, J OSEPH SLATER LEwrs, a subject of the Queen of Great Britain, residing at Birkenhead, in the county of Chester and Kingdom of England, have invented certain new and useful Improvements in Terminal Insulators, of which the following is a specification.

In terminal insulators, or in insulators at points where the wire takes a sharp turn, a different form of insulator is used from that used on ordinary posts. Hitherto a glass or earthenware insulator, very similar to the one I have shown in the drawings, has been used but the central hole has been made straight, with square-edged ends for a bolt to pass through, and the shacklestraps carrying the insulator have been attached by said bolt, while the line-wire has been looped round the body of the insulator in a groove formed between the two sheds or inverts, on the plan patented in England, No. 2,601 of 1858, by Sir Charles I. Bright. Now, I have found that this old arrangement prevents'the cleansing action of rain, and large deposits of rust from the straps and bolts soon cover the insulator, and consequently the insulating-surface is considerably deteriorated. great trouble with the bolt, and the flat straps serve to cause lodgme'nts of snow.

Figure 1 is a side elevation, and Fig. 2 a plan, of wire insulator and shackle as improved by me.

In these drawings, A is the insulator; B, line-wire; O, shackle; D, stationary support, fixed to post or other stationary object by bolt through bolt-hole G.

It will be seen that instead of the straight square-edged hole through the insulator, there is a hole with trumpet or rounded mouths, and in some cases I may make the entire hole (in longitudinal section) of curved contour, the two curves at the end being joined by a long flatter curve, so as to make the hole lesser in diameter at the middle, and gradually increasing in diameter at each end. For nearly all purposes, however, the section as shown is to be preferred. The line wire passes through this hole in a vertical loop. The two ends of the shacklestraps C are Besides this, there ispassed round the center and linked up by metal ring H or binding-wire. An insulatinglip, E E, above and below the said shacklestraps, prevents electrical contact.

The shackles O are made, as shown, with ends bent to a double or Z-shaped contour, so as to fit into the hole in the support D and bind fast in it. In erecting, the support is placed somewhat obliquely to the pull on the wire, and the shackle placed round and hinged or bound at H. The Zshaped shackle ends are then inserted in the hole I, resting on the end of support B of the wire, and placed in position. The wire is then attached in a vertical loop, and the weight of insulator and wire locks the insulator in position, and prevents the Z-shaped end of the shackle from rising and being drawn .out of its position.

I claim as my invention 1. A terminal insulator having a central vertical hole with rounded ends for the linewire to be looped into, and insulating-lips placed above and below the vertical center of the insulator, with a groove in the center for attachment, substantially as described.

2. In combination withaterminal insulator, A, a shackle, O,with its ends bent in two contrary directions, (like the letters S or 2,) and fitting into a hole in support D, substantially as described.

3. In combination with a terminal insulator, A, shackle 0, held in place by the weight of the line-Wire and shackle, with and having their ends hooked into the upper side of the support D, and bearing as a fulcrum upon the end of D while held' tight against the under surface of the support, substantially as described.

4. The combination of the terminal insulator A, the two shackle-straps O, the binding H, holding the two ends tight, and the support D, clasping the other two ends, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOSEPH SLATER LEWIS.

WVitnesses:

WM. P. THOMPSON, JOHN HAYES. 

